When you get a girl to kiss your grundle, holding back your sack & balls - but betray her at the last minute by letting them flop onto her face.
"Baby see how soft my taint is - give my grundle a kiss!"
*flop*
"You benedict grundled me!? I feel so betrayed!"
*flop*
"You benedict grundled me!? I feel so betrayed!"
by mutorcs December 12, 2009

by tobyistheworst November 18, 2011

During a fart, when air is compressed between the grundle and a hard surface- the air erupts to the nearest exit, usually out the front of the crotch. It is thunderous, not just for the thunderous noise it makes, but also because of the unsettling direction of the blow.
by ceegee2 January 23, 2013

by Vanderweasel September 24, 2019

by Gicky September 4, 2007

by Jimmy Dean May 16, 2004

When someone is rubbing your grundle or sack area intensly, and you chafe to the point of bleeding and then you let out very thunderous bloody shart onto your partners face.
by Peter Boardman October 8, 2005
